Physics
Scientific paper
Sep 1934
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1934natur.134..494d&link_type=abstract
Nature, Volume 134, Issue 3387, pp. 494 (1934).
Physics
7
Scientific paper
According to different authors1, 2, under appropriate conditions seeing is possible in the ultra-violet down to a wave-length as small as 3100 A. This fact has been confirmed on 21 persons (age 25-50 years) using as light sources discharge tubes containing (1) high-pressure mercury, (2) low-pressure cadmium and zinc (both in neon). The tubes were of quartz, 15 mm. × 120 mm. Visible light and short waves (<2700) were cut out by a red purple corex filter. Using one or more filters (each 5 mm.) the intensity of the Hg line 4047 relative to 3650 and 3130 could be varied within wide limits. A small monochromator (without second slit) was used to separate the different wave-lengths. As a result, the visibility for λ=3650 relative to 4047 could be determined. It was also possible to estimate the visibility for 3130.
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